How to print items from a dictionary when multiple values share the same key-CodePudding

I have a dictionary below that I'm trying to print the date for a certain day from. However, I'm getting a KeyError:

{
 'length': 601,
 'maxPageLimit': 2500,
 'totalRecords': 601,
 'data': [{'date': '2021-12-13', 'newCases': 97},
          {'date': '2021-12-12', 'newCases': 64},
          {'date': '2021-12-10', 'newCases': 108}, 
          {'date': '2021-12-09', 'newCases': 129}]

}

I am hoping to be able to print just 2021-12-13 and 97 for example

CodePudding user response：

As it's currently setup, you have your top-most dictionary with keys: length, maxPage, TotalyRecords and data. And then inside of data, you have a list with 2 indexes, each index being it's own dictionary.

If you wanted to get the dictionary for dec 13th, it'd be:

dict['data'][0] # First we go to the "data" key and get that. Then inside of the 
                data key we get index 0, which is {'date': '2021-12-13', 'newCases': 97}

If you wanted specifically the number of newcases, for example, it'd be:

dict['data'][0]['newCases'])

It's just about working your way down the chain of nested dictionaries and lists you have. Though there's probably a better way to accomplish what you're trying to do tbh

CodePudding user response：

There is no date key in your top-level dictionary. You need to index into data and then choose one of the dictionaries from that value before getting a date:

>>> dx = {
...  'length': 601,
...  'maxPageLimit': 2500,
...  'totalRecords': 601,
...  'data': [{'date': '2021-12-13', 'newCases': 97},
...           {'date': '2021-12-12', 'newCases': 64}],
... }
>>> dx.get('data')
[{'date': '2021-12-13', 'newCases': 97}, {'date': '2021-12-12', 'newCases': 64}]
>>> dx.get('data')[0]
{'date': '2021-12-13', 'newCases': 97}
>>> dx.get('data')[0].get('date')
'2021-12-13'

Also, note that multiple values do not share the same key. You have multiple dictionaries in a list, each of which have matching keys - but they are not the same dictionary!

CodePudding user response：

dates are used as values in your program so you need to use some kind of loop to access the required date.

for date in d['data']:
    if date['date'] == foo:
        # do your processing